Author Topic: Caustics, refraction, glass questions.  (Read 20485 times)

2013-03-09, 20:13:41

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile
Hi all. I am trying to design a perfume bottle and wondering a couple things. Does Corona support caustics yet? And if so how do I go about activating them. Also whats the best way to give glass that thickness look, I am still confused about when to use solid face vs thin faces. Also in vray there was the fog setting in material to change colour settings of say water ect. is there anything like that in corona that I am overlooking?

thanks in advanced.

2013-03-09, 20:22:27
Reply #1

Ondra

  • Administrator
  • Active Users
  • *****
  • Posts: 9048
  • Turning coffee to features since 2009
    • View Profile
hi,
caustics are always there, only sometimes they get clamped. You can set maximal sample intensity to 0 to get unbiased result, but you will probably get some fireflies. There are other algorithms for rendering caustics, but not in public beta, you'll have to wait for alpha 4 (1-2 weeks).

Use solid glass, thin is for windows.

There is absorption parameter in coronamtl working like vray fog
Rendering is magic.How to get minidumps for crashed/frozen 3ds Max | Sorry for short replies, brief responses = more time to develop Corona ;)

2013-03-09, 23:42:43
Reply #2

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile
This is about how far I have got playing around with the glass. I am not sure what I am missing so far, but I have seen a lot stronger results in the gallery.

My aim is to make something like this: http://www.jarrold.co.uk/UserData/root/Images/Beauty%20Images/Perfumery/L'Artisan/seville-a-l'aube.jpg

2013-03-10, 08:37:40
Reply #3

Polymax

  • Active Users
  • **
  • Posts: 830
  • CG Generalist
    • View Profile
    • maxkagirov.com
At this stage, only the GI caustics possible. Use IBL!
Corona - the best rendering solution!

2013-03-10, 17:58:20
Reply #4

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile
IBL? From reading a lot of the posts people seem to mention a lot of things that I have not seen with the Corona render? are they hidden?

2013-03-10, 18:07:39
Reply #5

Polymax

  • Active Users
  • **
  • Posts: 830
  • CG Generalist
    • View Profile
    • maxkagirov.com
IBL? From reading a lot of the posts people seem to mention a lot of things that I have not seen with the Corona render? are they hidden?
Put HDRI texture in enviroment and no more light.
Corona - the best rendering solution!

2013-03-10, 18:23:57
Reply #6

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile
yeah I already had a HDRI in the scene under Corona environment, so your saying its best not to use Corona lights with HDRI then?

2013-03-10, 18:51:32
Reply #7

Polymax

  • Active Users
  • **
  • Posts: 830
  • CG Generalist
    • View Profile
    • maxkagirov.com
yes, only HDRI! My work form the gallery, there is only HDRI:
http://forum.corona-renderer.com/index.php?action=dlattach;topic=452.0;attach=1779;image
Corona - the best rendering solution!

2013-03-10, 18:57:18
Reply #8

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile

2013-03-10, 20:45:28
Reply #9

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile

2013-03-10, 23:54:06
Reply #10

Jahman

  • Active Users
  • **
  • Posts: 45
  • Panteleev Sergey
    • View Profile
    • some of my scripts for 3ds max
high ior + a bit of reflection gloss randomness + brushed bump map + right mult of anisotropy
brushed steel = steel so material ior (reflectance) mostly constant.
my test in attachment

2013-03-11, 09:42:48
Reply #11

ecximer

  • Active Users
  • **
  • Posts: 286
  • Scriptobot
    • View Profile
Jahman, can you show me wire?
sorry for my english

2013-03-11, 09:56:39
Reply #12

Jahman

  • Active Users
  • **
  • Posts: 45
  • Panteleev Sergey
    • View Profile
    • some of my scripts for 3ds max
Ecximer, I'll post the result in a new topic some time later
there's my previous steel test. sorry for the img size

2013-03-11, 10:01:56
Reply #13

ecximer

  • Active Users
  • **
  • Posts: 286
  • Scriptobot
    • View Profile
0_o
Very high quality stuff out - well done!
Hdri can share?
sorry for my english

2013-03-12, 02:24:31
Reply #14

AnubisMe

  • Active Users
  • **
  • Posts: 118
    • View Profile
Okay, I made some progress. I am still having a hard time getting the glass just right, but even more so I am not sure how I can give the illusion that their is a yellow perfume liquid inside. The Absorption is giving me really strange results when I try it.